World four hundred and seven is with two straight lines of boxes.
Step by step solution
Go LEFT, LEFT, push UP and UP. Go DOWN, DOWN, LEFT and push UP. Go RIGHT, UP, RIGHT, UP, RIGHT, UP, UP, LEFT, LEFT, LEFT and push DOWN. Go UP, RIGHT, RIGHT, RIGHT, DOWN, DOWN, LEFT, DOWN, LEFT, DOWN, DOWN, RIGHT, RIGHT, RIGHT and push UP. Go DOWN, RIGHT, RIGHT and push UP.
Go DOWN, LEFT, LEFT, LEFT, LEFT and push UP. Go DOWN, RIGHT, RIGHT, UP, push LEFT, LEFT, go DOWN, LEFT and push UP. Go RIGHT, RIGHT, RIGHT, DOWN, RIGHT, RIGHT, UP, push LEFT, LEFT and LEFT. Go RIGHT, RIGHT, UP, UP, LEFT and push DOWN. Go UP, LEFT, UP, UP, RIGHT, RIGHT, RIGHT and push DOWN.
Go UP, LEFT, LEFT, LEFT, LEFT and push DOWN. Go RIGHT, UP, RIGHT, RIGHT and push DOWN. Push LEFT, go UP, LEFT and push DOWN. Go RIGHT, DOWN, DOWN, RIGHT, DOWN, DOWN, LEFT, LEFT, UP and push LEFT. Go RIGHT, DOWN, RIGHT, RIGHT, UP and push LEFT. Go UP, UP, UP, RIGHT and push DOWN.
Go UP, LEFT, LEFT, LEFT, UP, LEFT, LEFT, DOWN, push RIGHT, RIGHT, RIGHT, RIGHT, go UP, RIGHT and push DOWN.
Go LEFT, DOWN, DOWN, DOWN, DOWN, LEFT, LEFT, UP, push RIGHT, go DOWN, RIGHT, push UP and UP.
Go DOWN, LEFT, LEFT, DOWN, LEFT, LEFT, UP, push RIGHT, RIGHT, RIGHT, go DOWN, RIGHT and push UP.
Congratulations. You have completed world four hundred and seven. Get ready for world four hundred and eight.